#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define TTL 64
#define BUF_SIZE 30

int main(int argc,char *argv[])
{
    int send_sock;
    struct sockaddr_in mul_addr;
    int time_live = TTL;
    FILE *fp;
    char buf[BUF_SIZE];

    send_sock = socket(AF_INET, SOCK_DGRAM, 0);
    memset(&mul_addr, 0, sizeof(mul_addr));
    mul_addr.sin_family = AF_INET;
    mul_addr.sin_addr.s_addr = inet_addr(argv[1]);
    mul_addr.sin_port = htons((uint16_t)atoi(argv[2]));

    setsockopt(send_sock, IPPROTO_IP, IP_MULTICAST_TTL, &time_live, sizeof(time_live));
    fp = fopen("sender.txt", "r");

    while(!feof(fp)) {
        fgets(buf, BUF_SIZE, fp);
        sendto(send_sock, buf, strlen(buf), 0, (const struct sockaddr *)&mul_addr, sizeof(mul_addr));
        sleep(2);
    }
    fclose(fp);
    close(send_sock);
    return 0;
}